What is the best read range for a tag and reader?

The distance from which a tag can be read is the read range. There are environmental and application factors that may limit read range. Optimal conditions exist in an air environment with the tag placed perpendicular to the antenna field. Factors such as tag frequency, electromagnetic noise, metals and antenna power may affect the read range. Typically, the larger the tag the better the read range. Some tag and antenna combinations can read passive tags as far away as 18 inches. Most read ranges using hand-held readers are 3 to 9 inches depending on the reader.

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